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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb425513056a31c8f8a23ec9d67283bd0167689995d2c6573edc4358d714a5c8' 
  AND token = 'JoH8RyLQfVRyBLGjINgknW0W90ExEVIMUtlnFfZ25fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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