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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a37a2c433da15a4f950ace11e67d81a72c5626fe15a70ad1fa16fc090cbb3c7' 
  AND token = 'bSy4zn2TWWLRgqnKtTxXrztJBRU3oe9jDl4Oe7eGR+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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