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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b948c88a2a4d4027efa0852d6a55663673d5c8d4f2f51155c2f8b1bc1e8d85c1' 
  AND token = 'br8/zrNKqG3ur6GbDvSL8HUhqHQfUrwlyM/mmcl9ric=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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