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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b176aeb32a1f75d340330067c98aa9835cfebf7f96d5de1097a646676884d0e9' 
  AND token = 'C9MzTeEtlyBVWswDkTStcWwTkM9rWWTeCxjv6Rb1F5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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