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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198815e3df204c2c86a706d0b955a109f61c6e057a6bf8a1acb96a5862060ea2' 
  AND token = 'vCgk90NA3Awd9t30rrdb8JPvaH12BeTuY/zZA8bcAtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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