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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec6e64897c2312034a5f20f0ff9e7bd6672b3f6bc53852ca0470669ee69f93e' 
  AND token = '9ALYLIRig+LvY59iVtVqvqZNq9H9wpg54OjLXrDf470=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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