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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b779f40cfd222a8c1f8ce4b9f2fd3a161ba4e837bf92318bce2ff3dec432909' 
  AND token = 'oBnHCfMswBpOcadIqoWskYND7IgUvxJ3Gy+75EbfhDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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