SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32b28a54f41fabbe281e6d42e73cf93912da03d930f43b14c9af2f3b530f67e' 
  AND token = 'ysKRI6bOD6BqPmLNx/oJXnoWCPFvLjwQ5hNkqxA0kvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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