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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffa7191e31537730a7aaa42cf9516e38e716746bc8d075f695017d6c59b6dd7' 
  AND token = 'FJ2ldqfJery++VUu+xY76aFyVJTUvYJI621xIzgT72o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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