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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2140a9ed5a6e8c203c9d02bd4d8ab5e07f62aec7b2af14e695abbdac4696e269' 
  AND token = 'Wq3Pmr26LJ0nCP/a085J0cGmgDtgPKWuqwfmnh78N4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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