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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17071dd8971972147f01ee52f6f42645388d05abd7964dd487297da3c15f9c4e' 
  AND token = 'N7OQdOlApDaJj6KKkl/njyuHt7SrDkWMLJlyBesSNg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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