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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3076839e45f3317e8d907a14588a9eb42dc61b3ee8a76a31a9ec55e221533c68' 
  AND token = 'SayuKsbp8LqhndeYyCB38aiQOmgdyWvayjzlUl1Dbus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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