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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80b419f59e5213ae77eb5635a2cc6cbdbfca4546c73bbab7d5ccfb79c57eca8' 
  AND token = 'uiRNDSgJGHCj6+i128LNyZr7UzIHWs/Y7rqQDkv0Gys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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