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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607f1b0874bafd2ee00f6349387e45216656203ddf74b2c13d92581a37b0b103' 
  AND token = 'gyXvV/60WC47rAsUvEartk40m8Wudjk+xKzou6xbsV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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