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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34dd2812f243110871503defcee955756a5bdb4e50d2b2aaf85425aa738d1612' 
  AND token = 'sqgqsqd0jYARHC2bkMyc8N+BVS9AHPp6OEJ1+v6k6X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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