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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eef4480455be5a862c61aeec342ca14a36461300bb0c2a041d2bfa385f4f03d' 
  AND token = 'HQaZRNRfhjkulW0Ou+cUGQPd0LhXZeYXA+urpnj64JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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