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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e4b1347390b65ac3cbf2cc8285180aa205cbb2f1e91bc4099b1d67333a1502' 
  AND token = '7UUwmMRdL9PIJXC/5gYAhea6TiVSlgns3MAV0hqxk04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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