SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea053f7bbc0265bc2abc57273d8416e951ae459984ed45e5b6d6f3d87bbe837b' 
  AND token = 'b28Xz/I4W4GBs3hO8ojNwoj3YOnqJjIK8VDWh2ZHoas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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