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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d494df75866c1452a88d10c105dc1aa0edaee6affd5dd6c797ff1e1a2bd8798' 
  AND token = '07RJn4phf36RFjESCwUDJfRUa0kFt8q/Kc4K5JaOTVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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