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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ff611ea6384605a0943de731cb974be9ad0b0b5a37c22f7045152813c495c3' 
  AND token = 'TN7HHgWdur5PAjqj3O62MqFE3Cek3JExoD/9cH/IceE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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