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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886478bb40f8765f046921a850ed0f4ecf0a32d48083f2019b0d8d92b4856b71' 
  AND token = '80y09mUwnjgpyE8v3tI9h2kvn3sFjbv1OOcqF3h3kT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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