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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0f485bfdd091e59ff0b171adf3695564260110143470f444877d2d793a787e' 
  AND token = 'EtdQDorJuzJTzeb3JFf3Fmj4fZfvVW6Eh1pa5KYwL7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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