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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198c2d3e29c36555bdbd2fd0cb93153db2badc7c79b38b2eb405b38ba6c7a154' 
  AND token = 'hyl9nW7OCzH29e5qlrsk44MUB5bf0GbRXI7j0xc+v5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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