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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7982a73c6450a514ab503cf9af13a8c0c1dd1f1b5c5de080de4fe4cf9d081e34' 
  AND token = 'NepIPqbEwQzCrxI6iFT4yVaOBbKMHyk0tWbL7Ia3ncE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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