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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f7a61691f9cdf5948f65e1498ed970c874fb991449d6f27dd59b2f35f94515' 
  AND token = 'c1HU3h3smsfvshgCNfw/0x5nU0JxwZV2NkQ79D2VtCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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