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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8a2cb708623a0ac3739d459962c79dd01e3f9c7521ddddc0bf67ac9aa8e694' 
  AND token = '8EvEmOb2rNH76wv/bdshbNVAVUIyZHH72JtzKuAZ0cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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