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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1424a9681cad3c5ce61edd5438396e0510bb060d4267c2d749609587017272a' 
  AND token = 'TnNuLLeqcnmmDCSF9cGE87B2zxk1ikN28FR4fRX/EBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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