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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dea7d0d1bf90d0b83faf51380493dd6ad65d62670516f17ddc70a896c3f1abf' 
  AND token = 'UJH/zrnZmNUMch0B45+mGi9+smciA8wvF20BAPselbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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