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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4130d47213d10ae512ad363d0d09e24c4adfbc6c1ecdbecf24d62b341977399d' 
  AND token = 'cXsQQZGs84y7cI/lh/brD62Sdj6+wCtCziTT0SqXV94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}