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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12d4bfcf2ee3edffc5bd59ffba5ba8b64aa26161e5a5693ab0f0c177c4d368b' 
  AND token = 'WQSO77z4K2kwZkm/WSQbFm86rdEiGPEtRDOn7G4f5ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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