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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840b3f9927b64d7e80cc84537df9e1a4cadc1cca286b0e3c71a30ffdd8f14f33' 
  AND token = 'ou1fAc3FSig16O1bfbtKrHt5xw5j695XlSsHAWSTWDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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