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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6fb19a780213c0e0702b184fa71e111bd0291f255cd3b97dfd22ecf68cedaa' 
  AND token = 'OJfAOLLVQg75TQaC5eCHdKOnH5YzH81x2zI/dWNJbCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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