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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b6e2b14d51c6e323f43b9ea212cea7384bb086eb17ee96cb9646d34d2fd5dc' 
  AND token = 'LuSSUglLpXOQbZk7B3N4xAUogaxE0n1btKgboAdILzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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