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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766475ad7a4fa11f7c17d16bdabe688e0fd2bdb1bc79a15cc54611071c9e836a' 
  AND token = 'H5mBgFWaYOVcdSVjkiVCa8g61BIqGLjb/zR/IOdhbM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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