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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33169c7015e18ef4fdeaae0e4a73129076e390c711753bf86a6b337700c96436' 
  AND token = 'si/KYU0LmKWbkdX0lrRYeGfOS2NjTKobHkL2r1fITEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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