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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5c3066a447bed641c85a89de470eb3e515b2729ef79180f9215c31faf2fd82' 
  AND token = 'ocPBapV5ZF+NoiwMacJZ5CW2rmeNHDN5g9JbJVYjnxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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