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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b028b13e2e9fbe5e214c1985a3de9467bb2230a93322e70db9e125850f85c61' 
  AND token = '2fv8APkSn9exUTHQ61yCSAzL6fsPfRilN69PC9L/dPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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