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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf76c7a185cd18f42392c41de75fb4dd85d5c71e8b840e05ecc5e78d52cca4c' 
  AND token = 'u6esBkWF9BnFKthvfHQYNQV2YC1ZSaAh5LuxpIfphyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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