SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa03291ae6743516e051d913e0e92e7aff442bb63a57d54c738968bc06f5c3c0' 
  AND token = 'JYI7vUKSBwFyzpSc4uxWzgaaEOy3CenECqw/Lp0+mPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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