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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9983d10bc3fead65980ee73adb552f831871b994c2cb414c5ddda1ce8eb63007' 
  AND token = 'o1s80JyVWV2/wlCdr7IZmJVd2UhXRqYXv0fTAFuEFro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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