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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc87bb98f9fc0793191f8c5b7497a0955977d7a1bf7f35dd573e1d8612613c2' 
  AND token = 'YZwqWO1znj785ymXoCdoeLRgMvZslYGAyPQb9vn2LQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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