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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb85857d779a76fdf955e2d5430cd80875a04e638e2535c91afbb39ef0d8fbdc' 
  AND token = 'jJaSp+jSXjN6H5bI+u3+lF/k2B6bzJ95RcVWkUacbRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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