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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357d29d8b708f5ad3cdf0ef3a67f726a24a3813a0cc02fddec1fae10dfd91813' 
  AND token = 'KK0a/wi0UGqdSnKpP8G1Kxfx9vhZcowHcHECInZLJkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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