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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8097534dd2da177ef77ce52a1905957d0831de0dc7308f5d72a373d6b04bd9da' 
  AND token = '0gLuCt/JNNFKgYTjs7Bd2jgHZRnBjenSLQ2jxnl0Wk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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