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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4393af96a10ef09ad1b9c7f9394e6b906f646f8e2c6bd9f61af3035be719b1c9' 
  AND token = 'gtsll2JQ4aNgdivO9jFRrqx5KwTILs63Q/VdOvFbRVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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