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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd66fcca5b8ed0bae5bf5ea75a557db3c2f0ba05e51688212a307a217aaa3026' 
  AND token = 'NvYwZ+09+zESqEF3FAOOD96df0w3qX/GMojBkawSchU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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