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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bcc56e597a2f445b34c27615a9a3a2c3221c40a0592e63f7ff4d4cd8bc0e03' 
  AND token = 'voZcbNkxBqH9NwEbkAaMdNVxQiGIfqKqAE/SX3iR2yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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