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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61ad6d38dd88fd14d8a53e6b07bfbc16ab99cae57cc917fc9958bfac2c7fadb' 
  AND token = 'jfBNvaCUv6XLg52emVJXN5kZ42siSpyt7oAAp7mloq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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