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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941f4ff054dfb6e6c556a7bef001ad1dcccfae8dfa9d5623db5db04308b92b2d' 
  AND token = '/q/09zhWcSv+MaJSeOrBxD4LqPf3rbyBAa3yTp2LoRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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