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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098e8a07f441807ee0f40003a54c254870dd17753d7750a375d1cb2fb5a3cd79' 
  AND token = 'x/gRCE7uMaC0kIToVBdCUiMTdnkhuc+9aEy7R2HDn6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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