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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc963ac82d54164d42d2142d86ae1c5ea9e9932cb91a85848af8ef609699336' 
  AND token = 'TDr2M5rBvxQpvbTpBOb0rZlOwuS3qXq8hTonLuHjvCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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