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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39677336b9528b94afb6b38b2ce9c713d167eef2aa23320236f26fdc17f47f9' 
  AND token = 'D+T3X7sHUVLxhhnd42eGpvE100YUSihf20E6VopM/MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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