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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ee3a7f66e2ba6e6e73f8913b24efd16f9b7ba017c79954c392aece80b23e02' 
  AND token = 'Eyv4ptt3V4v726n38qHN5AKBPuAsd7wlLLd4w6zOGYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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