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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d78068408bbac436384a84eeee79caee5c4139a2c53da37c59541db08e7a59' 
  AND token = 'y09wpZbMLv8yN11t+LkVV83ObyqN5HT0wXh+WCuj+WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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