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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0da80dd357d5f76ee712cd09cd05266314e0829eb7ae8f9171d90f31a293aaa' 
  AND token = '7JyVYrhKJglWQRaXSj0Haw54B9ZfFsdhhjIT04BLhMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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