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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28be46efb10650d76106ebc79e30240e6a27a4dd82e8ed97dd5814b0ccc320e4' 
  AND token = 'kELqzWT0v1ZQ6PGI0AbTcc4AUde7xMLavwLHF+JfJB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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