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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7edb513cda41266e41e6c243ea26e1dd81d7fa2af541522f0ec52f96ca89498a' 
  AND token = 'RdNqcvnUj3XpTOIuA+NnzubYD5Vy/BdnZFf/FS9ss7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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