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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c395a4f4361e3065a8303c44af9a00d7a1f7e937f7fe7835a1303ca42a8269' 
  AND token = '95SFJfKvRclOFDbBe62+VXgzXD8SPnpbBsd4+ZfN1aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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