SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd35e5b364f4802230652bb8a0f461c3ef51e9d62888691f17a7feaf221c7bf' 
  AND token = 'Wnr+/l5AYR3QBni1vRN6rBpiAwEKfcJgG/NM9Iu4pwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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