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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d3bb2f1e93c9e2f66ca6e5f71624dd4a5c8abe86e7ec4cac49a56182a82955' 
  AND token = 'oVSYq8myJEDR58lfu2tumYrV4d7pEKPOpuNuRjvTynQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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