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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f19331684d8a236bba35afc1b2b6a476b778517e161a2bdfc60e785c224f24' 
  AND token = '0AuCAK64V8m4qnmBwl5X18yZbEwfBkl0Hubek0AFyD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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