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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2928e700c54e2dcf8597e4af2ed403550b5be3b86de83404df676307276696d0' 
  AND token = 'Qf7L0kFes3OgEMw9NEHrRnBx2Qz85WHkXfYeD84r8uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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