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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d7d5ec439c92754b14a06e388772eda661b07eaae83fbc548493ef560bdde3' 
  AND token = 'ouHAwA+O3QqvHXeeNbtPhb9c2jgsoeqqX0Zp9oUjR2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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